Răspuns:
Explicație pas cu pas:
Fie x km este lungimea intregului traseu.
[tex]\dfrac{4}{9}*x,~(I~zi)\\x-\dfrac{4}{9}*x=x*(1-\dfrac{4}{9})=\dfrac{5}{9}*x,~(restul~dupa~I~zi)\\\dfrac{3}{9}* \dfrac{5}{9}*x=\dfrac{5}{27}*x,~(II~zi)\\\dfrac{5}{9}*x- \dfrac{5}{27}*x=x*(\dfrac{5}{9}-\dfrac{5}{27})=\dfrac{10}{27}*x,~(restul~dupa~II~zi)\\\dfrac{6}{9}*\dfrac{10}{27}*x=\dfrac{20}{81}*x,~(III~zi)\\\dfrac{10}{27}*x-\dfrac{20}{81}*x=x*(\dfrac{10}{27}-\dfrac{20}{81})=\dfrac{10}{81}*x,~restul~dupa~III~zi)\\Deci~\dfrac{10}{81}*x=60,~~x=60:\dfrac{10}{81}[/tex]
[tex]x=60*\frac{81}{10}=81*6=486km[/tex]